Energy audit in the event of the sale of a property known as a « thermal sieve »

Estimation of energy performance before works

The audit includes the following elements:

• Estimation of pre-works energy performance according to calculation method used to perform the EPD. This estimate can be based on the data collected for the development of the last EPD of the building.
• Diagram showing the distribution of heat losses
• Information on existing control devices (measurement, regulation and control devices controlling the building equipment).

Proposed works

The audit must contain 2 minimum works proposals for achieving efficient renovation.

These proposals must comply with the following conditions:

• They must be compatible with the technical, architectural and heritage characteristics provided for in the Heritage Code (for example, in the case of a listed building)
• They must not be disproportionate to the value of the property (this is the case when the cost of works exceeds 50% the value of the property).

Each proposal must provide for a works route in 1 or more steps consistent with each other. They must make it possible to ensure satisfactory treatment of interfaces and interactions, in particular thermal bridges and airtightness, and to achieve a satisfactory level of hygrothermal comfort.

1^re proposal

It must provide for a works path in stages to achieve efficient renovation.

This works course includes the study of 6 works positions :

• Insulation of walls
• Insulation of low floors
• Roof insulation
• Replacement of exterior joinery
• Ventilation Replacement
• Replacement of heating and domestic hot water production and associated interfaces.

This works route must comply with the following conditions:

• The 1^re step of works must make it possible to achieve a gain of at least 2 energy classes and to carry out the treatment of 2 insulation stations
• The final stage shall achieve a level of performance at least equal to that of performance class B.

2^from proposal

It must provide for a works route in 1 single step to achieve efficient renovation.

This works course includes the study of 6 works positions :

• Insulation of walls
• Insulation of low floors
• Roof insulation
• Replacement of exterior joinery
• Ventilation Replacement
• Replacement of heating and domestic hot water production and associated interfaces.

Energy performance after works

The audit shall specify for each stage of the works pathway:

• Annual energy consumption primary and final building after works relative to its surface after works expressed respectively in kWhEP/m²/year and kWhEF/m²/year for each of the energy uses (heating, cooling, domestic hot water, lighting and auxiliaries)
• Total annual energy consumption primary and final building after works relative to its surface after works expressed respectively in kWhEP/m²/year and kWhEF/m²/year for all energy uses (heating, cooling, domestic hot water, lighting and auxiliaries). These consumptions are estimated with and without deduction of the self-consumed photovoltaic energy production.
• Greenhouse gas emissions of the building after works for all energy uses (heating, cooling, domestic hot water, lighting and auxiliaries) relative to the surface after works expressed in kgCO2eq/m²SHAB/year
• Energy Performance Rating after works, taking into account the total annual primary energy consumption for all energy uses (heating, cooling, domestic hot water, lighting and auxiliaries)
• Greenhouse gas classification of the building after works within the meaning of the DPE
• Estimated energy savings in primary and final energy, and avoided greenhouse gas emissions (in absolute terms, then in relative terms to the initial state before works)
• Estimating the theoretical impact of works proposed on annual energy costs, in the form of a cost-saving range.

Cost of works and mobilizable aid

The audit shall include the following information:

• Estimation of the cost of energy performance works and other works necessarily linked to the implementation of these energy performance works
• Main financial aid available to achieve these works.

The trader must ensure that a set of works is selected that is consistent with the expected energy savings and value of the property.

Ventilation or ventilation conditions of the building before works

The audit should include the recommended works on the opaque or glazed walls facing the exterior of the building.

Ventilation and heating installations may be accompanied by one of the following measures:

• Additional works to guarantee sufficient but controlled air renewal
• Recommendations on the management and maintenance of the ventilation system to ensure satisfactory air exchange conditions. When air renewal is insufficient or uncontrolled, works to address it are available as of 1^re stage of the works journey.

Synthesis Report

The audit gives rise to a summary report carried out in PDF format, including in particular the following information and documents:

• Inventory of the building. The trader may take over the inventory of the building in the DPE, after having checked beforehand during his visit that the elements of the standardized summary of this diagnosis are those actually implemented in the building and having corrected them if necessary
• Summary of all audit content items
• Annex explaining the various technical concepts
• Referral to the structures responsible for providing information, advice and support for energy renovation
• Justification of the technical, architectural, heritage or cost characteristics of the works which permit a derogation from the audit content
• Name and version of audit software used.

The summary report must be sent to you in a one month delay from the date of the visit to the building, in a format paper and computer science.

Standardized Summary

The audit shall also give rise to a standardized summary in the XML format including all the data entered by the professional and those calculated for the performance of the audit, in particular the following:

• General, including building administrative data
• Characteristics of the building envelope (surfaces, orientation, thermal characteristics, ...))
• Characteristics of technical systems (types of energy, generator, emitter, ventilation, presence of boiler-related ratio, ...)
• Building performance indicators before works (primary and final energy consumption, greenhouse gas emissions, annual energy costs, ...)
• Improvement recommendations and indicators of building performance after works (technical description of works, primary and final energy consumption, ...)
• Economic and financial analysis of the recommendations for improvement (estimation of the cost of works for improving the energy performance of buildings and other necessary works, financial aid available, annual energy costs after works, ...).